On Mon, Jul 27, 2015 at 10:10:12PM +0800, Zhang Rui wrote: > 2015-07-27 20:14 GMT+08:00 Clément Bœsch <u...@pkh.me>: > > On Mon, Jul 27, 2015 at 06:13:30PM +0800, Zhang Rui wrote: > >> 2015-07-15 21:51 GMT+08:00 Clément Bœsch <u...@pkh.me>: > >> > On Sat, Jun 20, 2015 at 01:33:00PM +0200, Sebastien Zwickert wrote: > >> >> Old videtotoolbox patch rebased and updated to target the new HWAccel > >> >> API. > >> >> As VDA is a wrapper of VideoToolbox framework, the changes base vda > >> >> implementation > >> >> upon the videotoolbox implementation to factorize common part of code. > >> >> > >> >> --- > >> >> Changelog | 1 + > >> >> MAINTAINERS | 1 + > >> >> Makefile | 5 +- > >> >> configure | 19 +- > >> >> ffmpeg.h | 2 + > >> >> ffmpeg_opt.c | 5 +- > >> >> ffmpeg_vda.c | 134 -------- > >> >> ffmpeg_videotoolbox.c | 147 +++++++++ > >> >> libavcodec/Makefile | 12 +- > >> >> libavcodec/allcodecs.c | 5 + > >> >> libavcodec/h263dec.c | 3 + > >> >> libavcodec/h264_slice.c | 4 + > >> >> libavcodec/mpeg12dec.c | 3 + > >> >> libavcodec/vda.c | 2 +- > >> >> libavcodec/vda_h264.c | 154 +--------- > >> >> libavcodec/vda_internal.h | 33 -- > >> >> libavcodec/vda_vt_internal.h | 57 ++++ > >> >> libavcodec/version.h | 2 +- > >> >> libavcodec/videotoolbox.c | 705 > >> >> +++++++++++++++++++++++++++++++++++++++++++ > >> >> libavcodec/videotoolbox.h | 126 ++++++++ > >> >> libavutil/pixdesc.c | 4 + > >> >> libavutil/pixfmt.h | 2 + > >> > > >> > I tried on iOS (iPhone 6+ so last one unless I'm mistaken) with a 240fps > >> > footage, and it seems the decode calls take more than 5ms, which seems > >> > not > >> > enough. Do you have any idea what could cause this? (I'm running a timer > >> > after/before avcodec_decode_video*()) > >> > >> 1. kVTDecodeFrame_EnableAsynchronousDecompression can make it faster, > >> but not suitable for sync-style API (avcodec_decode_video*()) > > > > not suitable in the sense that it wouldn't work, or it would have > > undesirable side effects? > > It would work, but it would be better and easier if decoder's input > and output are decoupled.
> Anyhow, as wm4 said, it's probably not worth the trouble. > Well, if it makes possible for ffmpeg to decode 240fps footage @ 240Hz that's kind of worth the trouble IMO. The HW decoder seems to be able to decode frames between 700 to 1100µs, which makes it possible to handle such material. A factor 5 to 6 with FFmpeg is kind of a problem IMO. [...] -- Clément B.
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